Tool for straightening well casings



Jan. 12 1926. 'fzg 0 DUD l TOOL FOR STRAIGHTENING WELL GASINGS FiledDec. '27, 1923 A TTORNEYS.

Patented dan. l2, 192%.

OSXVALD DUBA, F ,HOUSTONy-TEXA s rA'rsurorrice. f

,y A essrGNoR To YREED'R'OLLER Brrcolvirnn, vor notieren, Yrex.Acenronnrron or TEXAS.

TGOL STRAGE'XTENNG WELL CASINGS.

Appleman filed December 27,1923. 'serial iroyeszee.

Houston, in the county of Harris and State i of Texas, have inventedcertain new and use- Y ful Tmprovementsin Tools for SraighteningVell'Casings, of which the following is a specification.

The invention is designed for expanding or straightening out the casingsof oil wells or the like. d(lne object of the invention is to provide atool of rugged construction having the capacity to act on the part to bestraightened out by stages, and for this purpese T provide expanding orstraightening rolls arranged in a plurality of stages or sets which actin succession upon the part to be expanded or straightened. I alsoprovide means for supplying flushing fluid to the rollers and to theinterior of the well casing.

In the drawings- Figure 1 is a part side elevation and verticalsectional view of the tool.

Fig. 2 is a cross sectional View on line 2-2 of Fig. 1.

Fig. 3 isa cross .sectional view of Fig. 1 on line 3 3, and

Fig. t is a cross sectional view on line 4-4 of Fig. 1.

The main body of the tool consists of an part upper portion 5 ofcylindrical form, this be-v ing the largest diameter part of thek tool.Relow this large diameter portion there is a downwardly taperingAportion 6, which merges into a cylindrical portion 7 which is of'smaller diameter than the upper cylindrical portion 5, and below thisportion 7 the body is again tapered downwardly, as at 8 and below thisis' a still smaller cylindrical portion 9 ending` in a downwardlytapered point 10. Tn the tapered portions of the body lateral recesses11 are provided, and in the lower set of recesses are mounted rollers12. These are mounted on bearing pins 13 which are set in inclinedpositions, convergent downwardly towards the vertical axis of the tool.These pins bear at their upper and lower ends in the body and they areintroduced into position through recesses 11i formed in the body of thetool above the upper bearings of the pins. The pins have heads 15. Theyare retained in place by screw threadedstuds 16.

The rollers are generally of cylindrical form with tapered upper andlower ends. They project from the recesses slightly beyond the body'ofthe tool to bear on the well casing and they are smooth surfaced thoughother formations may be employed.

The upperset of inclined rollers 12 are mounted in a mannerV like thosejust kdescribed, but the body of the tool being of larger diameterherethese rolls stand out further away from the vertical aXis of thetool than ydo the l'set shown at 12. Their ages are parallel with theaxes of the rolls They lie as a .set in a horizontal plane somewhathigherthan the horizontal ,plane in which the set of rollers 12 lie, thetwo sets ofrollers being separated by the cylindrical' portion 7 of thebody.- The upper` set of rollers 12 are arranged with their axesparallel with the vertical axis of the tool.

threaded tapered shank by which it may be attached to the pipe by whichit is supported andV rotated.

The tool has an axial bore 17 of two different diameters and from thelower end of this channel conduits 18 diverge and have their outlet ends19 disposed? in vertical ref cessesQO formed in the opposite sides ofthe lower reduced end of the tool. AlWater or slush is forced downthrough the central The tool at its upper end has a screw` bore and thisis discharged through the cony duits 1 8 and the lateral recesses 20 soas to create a circulation of fluid from the lower end of the toolupwardly along its sides with the effect that the rollers are cooled andlu 1 bricated and any7 material tending` to accumulate within the casingof the well, within which the tool is working, will be washed away andcarried to the top of the well where it is discharged. a

This flushing fluid will reach the journal pins through ports 21 formedin the body of the tool.

Tn the operation of the device the two setsv of rollers similarlyinclined but located at different levels and at different distances fromthe axial center of the tool will give a two stage rolling out orstraightening action on the deformed part of the casing. The lower setof rollers being nearer the vcenter of the tool will of course act firstand after these have performed their action then the second set ofrollers l2 come, as the tool is lowered, into play, and perform thesecond stage of the straightening action, and following this, at aninterval, is the smoothing action of the upper series of rollers.employing a two stage inclined roller organization, comparatively shortrolls may be used, with comparatively closely set bearings for eachroll, enabling short bearing pins to be employed all of whichcontributes to the rugged character of the tool. Y l

In some instances the lower rolls will have completed their action onvthe deformity and straightened this out to the extent of .the capacityof these rolls before the next-set of inclined rolls begin to performtheir work, so that the work is performed gradually, rapidly and withthe expenditure of a minimum amount of power.y By carrying the flushingfluid down to the reduced point, it is discharged at a level below allof the rollers so that the return flow will bring the flushing fluidagainst all of the rollers.

I claim:

l. l-r tool for straightening or expanding deep well casings comprisinga rotary body having a lower set of rollers to engage the casing,ano-ther set of rollers at a higher level than the first set, and withits niez'abers located at a greater distance from the vertical axis ofthe tool than those of the lower set, the rollers of both sets beinginclined upwardly and outwardly and at substann tially the same anglewith the vertical axis of the tool and pins seated at their ends in therotary body and on which the rollers turn, said rotary body having apassage for flushing water, substantially as described.

2. A tool for straightening or expanding deep well casings comprising arotary body having a lower set of rollers to engage the casing, andanother set of rollers at a higher level than the first set, and withits men'ibers located at a greater distance from the vertical axis ofthe tool than those of the lower set, the rollers of both sets beinginclined upwardly and outwardly and atsubstantially the same angle withthe vertical axis of the tool, the body of the tool having a downwardlytapered portion for each sot of inclined rollers with a substantiallycylindrical body portion between the tapered portions, substantially asdescribed.

3. A rotary tool of the character described having a pointed lowerportion of reduced diameter, two downwardly tapered portions ofdifferent diameter with the larger diameter portion uppermost and with acylindrical portion spacing apart and connecting the upper and loweradjacent parts of the two tapered portions and having also an upper'cylindrical portion of a diameter substantially equal to the largerdiameter of the upper taperedportion, inclined rollers mounted lin thetapered portions, and rollers in the upper cylindrical portion andslightly projecting therefrom, substantially described.

4. In combination in a rotary tool for straightening well caslings, abody having a large diameter upper portion and a reduced diameter lowerportion, rollers mounted in pockets of said portions, said body havingits lower end extending below the lower most roller and reduced Iindiameter in respect to the said reduced diameter lower portion, saidbody having a flushing liuid conduit extending lengthwise thereof fromits upper end with ports extending therefrom through the reduced lowerend at a point below the lowermost rollers, substantially as described.

In testimony whereof, I aiiix my signature.

OSWALD DUDA;

